For all meaningful fiat currencies, there's at least a moderately sized, easily definable, reasonably contiguous market that will accept the currency without a hassle. Even a stack of 5000KPW notes, you could take them to a shopping centre somewhere and spend them, although that shopping centre is in Pyongyang.

Conversely, Bitcoin acceptance tends to be a few random scattered vendors, and technical obstacles (poor connectivity) make it harder still. Even in El Salvador, despite their attempts to make it a legal tender, you're not going to be able to reliably and seamlessly spend Bitcoin.